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Speer used to sell a 120gn IIRC, but haven't seen them around for a while. Like Dan says Horn has the best selection of flat nosed bullets for the old lever guns, that's what I use for most of my old Wins.
I get Dale at Chinchaga Bullets in Peace river to make them up for me. He did a batch of 145g FP and some 155flat points. No cannelure to crimp though, I use my cannelure machine from corbin to do this. chinchagabullets@hotmail.com is the last e-mail I used